SIST EN 14570:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ausrüstung von Behältern für Flüssiggas (LPG), oberirdische und unterirdische AufstellungEquipement des réservoirs GPL aériens et enterrésEquipping of LPG tanks, overground and underground23.020.10UH]HUYRDUMLStationary containers and tanksICS:Ta slovenski standard je istoveten z:EN 14570:2005SIST EN 14570:2005en01-julij-2005SIST EN 14570:2005SLOVENSKI
STANDARD



SIST EN 14570:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14570May 2005ICS 23.020.30English versionEquipping of LPG tanks, overground and undergroundEquipement des réservoirs GPL aériens et enterrésAusrüstung von Behältern für Flüssiggas (LPG),oberirdische und unterirdische AufstellungThis European Standard was approved by CEN on 15 December 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14570:2005: ESIST EN 14570:2005



EN 14570:2005 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms, definitions and abbreviations.4 4 Tank equipment.6 5 Operational functions.7 6 Equipping.11 7 Checking and testing.11 8 Storage, handling and transportation.12 9 Documentation.12 Annex A (informative)
Example of alternative means of over pressure protection for underground/mounded tanks.14 Annex B (normative)
Settings and discharge rates for pressure relief valves.15 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC.17 Bibliography.18
SIST EN 14570:2005



EN 14570:2005 (E) 3 Foreword This document (EN 14570:2005) has been prepared by Technical Committee CEN/TC 286 “Liquefied petroleum gas equipment and accessories”, the secretariat of which is held by NSAI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest by November 2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC. For relationship with EU Directive 97/23/EC, see informative Annex ZA, B, C or D, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 14570:2005



EN 14570:2005 (E) 4 1 Scope This European Standard specifies requirements for the equipping of LPG tanks, overground and underground, with a volume not greater than 13 m3 manufactured in accordance with EN 12542, EN 14075; or equivalent and have been hydraulically tested.
The equipment covered by this European Standard is directly mounted onto the tank connections. This European Standard excludes the equipping of depot storage tanks and refrigerated storage tanks. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 751-2:1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds EN 751-3:1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes EN 12542:2002, Static welded steel cylindrical tanks, serially produced for the storage of Liquefied Petroleum Gas (LPG) having a volume not greater than 13 m³ and for installation above ground - Design and manufacture EN 13153, Specification and testing of LPG cylinder valves - Manually operated EN 13175, Specification and testing for Liquefied Petroleum Gas (LPG) tank valves and fittings EN 13799, Contents gauges for LPG tanks EN 14071, Pressure relief valves for LPG tanks - Ancillary equipment EN 14075:2002, Static welded steel cylindrical tanks, serially produced for the storage of Liquefied Petroleum Gas (LPG) having a volume not greater than 13 m³ and for installation underground - Design and manufacture EN 14129, Pressure relief valves for LPG tanks EN ISO 10497, Testing of valves - Fire type-testing requirements (ISO 10497:2004) 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1.1 fixed level gauge device to indicate when a predetermined liquid level in a tank has been reached or surpassed 3.1.2 off-take connection opening from which product in the liquid or vapour phase is drawn from the tank for the purpose of being consumed SIST EN 14570:2005



EN 14570:2005 (E) 5 3.1.3 depot storage tank LPG tank at an installation where LPG is stored before being transferred into bulk tankers and/or LPG cylinders for distribution 3.1.4 remotely operated operated from a point at least 3 metres from the tank 3.1.5 drainage process of removal of residual tank content 3.1.6 liquid removal withdrawal of LPG from the tank for a purpose different from the normal use of the LPG (e.g. removal of LPG for decommissioning, maintenance or in case of an emergency) 3.1.7 tank vapour service tank equipped for delivery of vapour to the customer through natural vaporisation 3.1.8 tank liquid service tank equipped for delivery of liquid to the customer 3.1.9 connection boss, flange, pad provided at an opening for the purpose of attaching equipment piping or pipe fittings 3.1.10 fail-safe shut-off valve valve that returns to its safe position in case of actuating power failure or fire engulfment failure 3.1.11 shut-off valve valve to provide a leak-tight seal which is operated manually, remotely or is self-closing 3.1.12 automatic maximum fill level control device that automatically stops the filling of liquid into the tank when a predetermined level has been reached 3.1.13 thermal expansion valve self-closing valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges fluid at a predetermined pressure 3.2 Abbreviations PRV Pressure Relief Valve, PS Maximum allowable pressure PED Pressure Equipment Directive (Directive 97/23/EC ) SIST EN 14570:2005



EN 14570:2005 (E) 6 4 Tank equipment 4.1 General The supplier of the equipped tank or the tank user/owner shall have a written procedure covering all aspects of the selection and assembling of the equipment and for testing of the equipped tank. Tank connections, that are not in use or piped up during normal operation, shall be plugged or blanked off. A valve may be fitted between the connection and the plug or blind flange. Except for PRVs and level gauges, all operating valves shall be protected from unauthorized operations. This can be achieved by enclosure within a lockable valve cover, secure compound or other suitable means. In the case of underground/mounded tanks, when valves are below the ground/backfill level, the valves shall be enclosed in a suitable access chamber. 4.2 Selection of tank equipment The selection of tank equipment is related to the size of the tank and / or the complexity of the operation, and shall match the level of safety required. Tank equipment shall be rated for the maximum allowable pressure of the tank (PS). Tank equipment shall be selected to meet the design conditions of the tank and shall be in accordance with
EN 13175 (or EN 13153 for manual shut-off valves up to DN 25), EN 13799, EN 14071 and EN 14129, as appropriate. Normal service connections, where the passageway diameter into the tank is greater than 1,5 mm and up to 3 mm for liquid and 8 mm for vapour, shall be equipped with a shut-off valve. Normal service connections, where the passageway diameter into the tank is greater than 3 mm for liquid and
8 mm for vapour, shall be equipped with at least one of the following:  a remotely operated fail-safe shut-off valve;  an excess flow valve plus manual shut-off valve;  a non-return valve plus manual shut-off valve. Where two valves are fitted, they shall be located as close as practicable to each other. These requirements shall not apply to:  PRV’s;  filler connections including a double non-return valve;  occasional withdrawal valves which include an integral excess flow/non-return valve; and  level gauges. Where valve actuators are fitted, they shall be sized to operate the valve at the maximum pressure likely to be seen in service. Remotely operated failsafe shut-off valves shall be fire safe in accordance with EN ISO 10497 and shall close in a controlled manner so as to avoid excessive pressure surge in the piping system, unless provision is made to protect the pipe-work in such a situation. SIST EN 14570:2005



EN 14570:2005 (E) 7 4.3 Screwed joints Screwed joints shall only be used for joint sizes of DN 50 or less. However, larger screwed joints are permissible for proprietary items such as relief valves. Where the thread provides the seal, tapered threads shall be used. 4.4 Seals and gaskets Seals and gaskets shall be selected taking account of the maximum allowable pressure of the tank (PS). Gaskets shall be selected to match the size and design of the flanges and be used in strict accordance with the manufacturer's specifications and recommendations. PTFE tape shall comply with EN 751-3:1996 Class G. Thread sealing compounds shall be non-hardening types complying with EN 751-2:1996 Class C. 5 Operational functions 5.1 General Tanks shall be equipped to provide the operational functions detailed as "Mandatory" in Table 1. Tanks may be equipped to provide the operational functions detailed as "Optional" in Table 1. Table 1 —Operational functions
Function Clause Tank vapour service Tank liquid service
Pressure relief
5.2 M M Drainage 5.3 O O Liquid removal 5.4 Ma O Maximum fill or indication/control 5.5 M M Filling system 5.6 M M Vapour off-take 5.7 M O Vapour return 5.8 O O Liquid off-take 5.9 O M Liquid return 5.10 O O Temperature indication 5.11 O O Pressure indication
5.12 O O Liquid Level indication 5.13 M M Potential bonding point b 5.14 O O Earthingb 5.15 O O a Where liquid take-off is provided this becomes Optional b Unless required by national regulations NOTE 1 M = Mandatory, O = Optional. NOTE 2 Depending upon operational or safety requirements, remote operation or reading may be provided as desired, except for PRVs. NOTE 3 Underground or mounded and semi-mounded tanks are not earthed if they are fitted with a cathodic protection system.
SIST EN 14570:2005



EN 14570:2005 (E) 8 5.2 Pressure relief 5.2.1 General The tank shall be protected by a PRV(s) in accordance with Annex B. Underground/mounded tanks may be exempted from the requirements on a PRV or a thermal expansion valve, if the tank is protected from over pressure during operation by alternative means. This shall be clearly indicated in the manufacturer's operating/installation instructions. An example of appropriate alternative means is given in Annex A. PRVs shall be connected to the vapour phase of the tank. If the PRV or thermal expansion valve is located inside the valve cover, the cover shall be provided with a sufficient sized hole so as to allow free discharge. PRVs shall be fitted with rain protective devices that will not obstruct the free discharge of gas. 5.2.2 Isolating devices and manifolds 5.2.2.1 Shut-off valves shall not be fitted between a PRV and the tank. However, a suitable isolating device may be used to facilitate the exchange of the PRV, provided this device is retained in the fully open position by the presence of the relief valve and closes before the relief valve is completely removed (see EN 14071). 5.2.2.2 Any manifold for PRVs shall be in accor
...